Non-HDMI sound. Sound attained by a non-HDMI cable must be obtained from your laptop's headphone or S/PDIF jacks. The headphone jack will give you stereo sound, while the S/PDIF jack will give you 5.1 surround sound. You may set your default sound jack by going to Start > Control Panel > Sound. First, switch on the TV using the remote control. After that, press the Menu button on the remote control to open up the Vizio TV menu. Then, select Audio Settings. After that, select the Advanced Audio option. A new menu will open up and in that menu, look for the RSS TruVolume setting. 2 Try a Working Cable. 3 Try Switching TV Inputs. 4 Power Off and On TV and HDMI Source. 5 Computer Connected to TV. 5.1 TV Not Recognised as an HDMI Device. 5.1.1 Connect a Separate Audio Cable. 6 TV Recognised as HDMI Device But No Sound. 6.1 Go to Control Panel. 7 Additional Windows HDMI Audio Troubleshooting Guide. Choose this, then underline and choose "Reset TV/Audio Settings.". To finalize the reset, press the play button three times straight. If the audio and video settings reset is unsuccessful, try a complete factory reset. 'System Settings' and 'Advanced System Settings' should be chosen. Highlight Audio & Video and press the SELECT button. Highlight Volume Control and press the SELECT button. 2. Highlight Fixed and press the SELECT button. 3. Press and hold the SETUP button on the Cox remote until the POWER button blinks twice. 4. Press and release the VOL + button, the POWER button will blink two times. Step 1: Go to the System Tray and click on the Sound icon to open the volume controls. Step 2: Click on > symbol at the end of the volume control bar. Step 3: Click on the desired HDMI output from Check your TV's sound setting and make sure it is not causing audio inequality. Also, check and correct your Toshiba TV's equalizer settings. 7. Toshiba TV Volume Control Not Working . If using the Toshiba TV remote control or TV button, you fail to control your TV's volume, which means something is hampering the easy functioning of your TV. Available screens and settings may vary for televisions sold in other countries. Increase the TV's volume. Perform a Sound Test. Check for a software update. Test the HDMI cable. Disconnect and reconnect the external device's cable. Connect a different external device. 4B16q.